The design of the HRSG in a cogeneration system depends on what factors?

In the context of designing a Heat Recovery Steam Generator (HRSG) for a cogeneration system, the correct answer focuses on thermal and electrical requirements. The HRSG is a critical component that utilizes exhaust gases from a combustion process (like in gas turbines) to produce steam. This steam can then be used for various applications, including generating additional electricity or providing heat for industrial processes.

Thermal requirements pertain to the amount of heat that needs to be captured from the exhaust gases to ensure efficient steam generation. This includes considerations for temperature and pressure conditions during operation, which dictate the size and specification of the HRSG components to effectively capture and transfer the heat.

Electrical requirements are significant as they define the overall system's output and efficiency. In a cogeneration setup, the design must balance the thermal output available from the HRSG with the desired electrical power generation. The efficiency of the system largely hinges on how well the thermal energy is transformed into electrical energy.

The incorrect options emphasize mechanical and volumetric aspects, which, while they can play a role in the overall machinery and structural design, are secondary to the primary functional needs that arise from thermal and electrical considerations. Therefore, focusing on thermal and electrical requirements captures the essence of the design priorities necessary for an effective